Question

(x+7) (x+9) =(x+3)(x+21) ​

Answer 1

Answer:

x= 0

Step-by-step explanation:

in the attached image.

Hope this is Helpful...

Answer 2

Answer:

(x+7) (x+9) = (x+3) (x+21)

=>

${x}^{2} + 9x + 7x + 63 = {x}^{2} + 21x + 3x + 63 \\ {x}^{2} + 16x + 63 = {x}^{2} + 24x + 63 \\ 16x + 63 = 24x + 63 \\ 63 - 63 = 24x - 16x \\ 0 = 8x \\ \frac{0}{8} = x$